[tiagosiebler]

Summary

• List all nine Coinbase clients and link each product to its guide and API reference.
• Clarify that Advanced Trade spot and US futures use CBAdvancedTradeClient, while international derivatives use CBAdvancedTradeGlobalClient.
• Describe the shared WebSocket subscription keys and the separate Global WebSocket API, and update the sidebar labels.
• Explain the SDK README's standalone Webpack bundle as a separate packaging option from the Vite and React projects.

Validation

• All 62 existing content, compatibility-report, release, CI-planning, site and release-automation tests pass.
• All 40 generated starter projects match their maintained sources.
• Full release build passes for all five SDKs, including Coinbase 1.3.1 TypeDoc generation and VitePress output.
• The final site validator passes for 4,074 pages, 253,002 links and 44,773 asset references.
• The existing Coinbase Vite starter production build passed against the current npm package during preparation.
• git diff --check passes.

This changes four documentation/navigation files only.